igneous
Weathered granite or granitic gneiss
Granite; mainly quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale gray-green to tan with dark mica/iron staining; glassy quartz and blocky feldspar may be visible. Hardness about 6–7 Mohs, nonmetallic luster, massive texture with poor cleavage as a whole, and typical specific gravity of 2.6–2.7.
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Physical properties
Coarse-grained, pale gray-green to tan with dark mica/iron staining; glassy quartz and blocky feldspar may be visible. Hardness about 6–7 Mohs, nonmetallic luster, massive texture with poor cleavage as a whole, and typical specific gravity of 2.6–2.7.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep in the crust, generally during Precambrian to Phanerozoic continental crust formation; surface weathering produced the rough, stained exterior.
Uses & applications
Commonly used as building stone, aggregate, monuments, countertops, and landscaping material; this unpolished fragment has little jewelry value.
Geological facts
The specimen appears strongly weathered and may include altered feldspar or iron-oxide coatings, making exact identification from an image uncertain.
Field identification & locations
Look for interlocking quartz, feldspar, and mica grains and a speckled texture; granite is widespread worldwide, including India, Brazil, Canada, Scandinavia, and the United States. A streak, hardness, and close grain inspection would help distinguish it from quartzite or gneiss.
